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A solid acid of tungsten-niobium oxide was obtained by evaporating the water from a mixed solution of ammonium metatungstate and niobium ammonium oxalate in water in the ratio 7:1 of W to Nb, followed by calcining in air at 400°C. The catalytic activity of the solid acid for decompositions of toluene, ethylbenzene, and cumene was higher than those of tungstated zirconia, mordenite, and silica-alumina...
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